Which of the following is not a function of a contracting officer?

A contracting officer plays a crucial role in the procurement process, and their main functions typically include negotiating contract terms, conducting market research, and monitoring project delivery timelines. Each of these functions is essential to ensure that contracts are established effectively, that the government receives good value, and that projects are completed on schedule.

The role of a contracting officer primarily revolves around the acquisition process and managing contracts effectively but does not usually encompass performing audits on contracts. Audits are typically carried out by independent auditors or oversight personnel who examine contracts for compliance with regulations, integrity of financial reporting, or adherence to terms. This separation helps maintain objectivity and prevents conflicts of interest that could arise if contracting officers were involved in auditing their own contracts.

Therefore, the function that is not attributed to a contracting officer is performing audits on contracts, making it the correct choice.